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B. T. NOBLE.

WORK HOLDER.

APPLICATION FILED APR. to. 1916.

Patented Aug. 1, 1916.

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BOUGHTON T. NOBLE, OF PLANTSVILLE, CONNEGTICUT, ASSIGNGR TO THE CLARK BROS. BOLT 00., OF MILLDALE, CONNECTICUT, A CORPORATION.

"WORK-HOLDER.

Specification of Letters Patent.

Patented Aug. 1, acre.

To all whom it may concern.-

Be it known that I, Boner-Iron T. NOBLE, a citizen of the United States, residing at Plantsville, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in FVork-I-Iolders; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this applicatlon, and represent, in

Figure 1 atop plan view of a work holder constructed in accordance with my invention. Fig. 2 a side view of the same. Fig. 3 a sectional view on the line ae-b of Fig. 1.

This invention relates to an improvement in work holders, particularly adapted for holding blanks for forming stud bolts or other devices While they are subjected to the operation of pointing, milling, threading or other operations.

In machines for pointing, milling or threading blanks, it is essential that the blank or work should be rigidly held ;at

the same time provision should be made for the release of the work in case it is wrongly presented to the work holder aws or to the tools.

The object of this invention is to provide a work holder for automatic or semi-automatic machines in which the work is firmly held but adapted to be released in case of misplacement; and the invention consists in a work holder having certain details of construction as will be hereinafter described and particularly recited in the claims.

In carrying out my invention, I form the work-holding jaws 2 each with a stem 3 which is adapted to pass transversely through a hole 1 formed for them in the outer ends of levers 5 which are pivotally mounted upon a suitable slide (3. Extending transversely through the stem is a hole 7 through which a pin 8 extends, the ends of the pins passing through a collar 9 located on one side of the outer end of the levers 5, the outer end of the stem 3 being threaded to receive nuts 10 so that the work-holding jaws are connected in a practically rigid manner with the levers. These pins 8 are formed from comparatively soft wire suiticiently strong to support the work in the normal operation of the machine, but soft enough to break in case of accident. These levers may be moved so as to force the jaws together or apart in a variety of ways. As

herein shown, they are provided with in wardly projecting pins 11 near their inner ends between the ends of which pins the upper end of the dog 12 is adapted to be forced, this dog being hung in the slide and adapted to have its lower end moved rearward so as to force the upper end between the pins 11 by a cam 13 on a driven shaft 14, and to have its lower end moved forward so as to withdraw the upper end from between the pins by engaging with a stud 15 mounted on the shaft 1%. The slide 6 as herein shown, is driven by a cam 16 on the shaft 14 cooperating with a roller bearing 17 on the slide 6, which is moved forward against the tension of a spring 18.

As shown in Figs. 1 and 2 of the drawings, the work-holding jaws are in the open position, and the slide is at the limit of its rearward excursion, the j aws having just released one piece of work and open for the reception of another piece. The work of whatever character it may be, is placed between the work-holding jaws 2 and held in line therewith until the slide 6 starts its forward movement under the action of the cam 16, and the cam 13 striking the dog 12 moves its upper end forward between the pins 11 so as to crowd the work-holding jaws against the work which is then advanced toward a tool holder 19 for pointing, milling, threading, or performing the desired operation upon the blank. On the return movement of the slide and just before it completes its rearward movement, the lower end of the dog 12 strikes the stud 15 and its upper end is thrown rearward from between the pins 11 allowing the work-holding jaws to separate and drop the work held by them, the machine being timed so that the work-holding jaws remain open long enough for the presentation of a new piece of work between them before the slide begins its advance movement. In case the blank is not properly presented between the work-holding jaws, or in case the work strikes some obstruction in entering the tool holder, the pressure will come upon the pin 8, and the ends of that pin will be sheared oif, so to speak, so as to allow the jaws to separate suihciently to drop the work held between them. If this takes place it is only necessary to drive out the old pin and insert another in order to restore the work-holding jaws to their normal condition.

I claim p 1. A work holder comprising a pair of levers each carrying a jaw at its outer end, said jaw comprising a stem extending through said levers, and a transverse pin coupling the work-holding jaws with the levers.

2. A work holder comprising a pair of jaws each having a stem, levers through which said. stems extend, collars on. said stems and bearing against said levers, pins extending through the collars and stems,

Copies of this patent may, be obtained for whereby the work-holding jaws are spaced with relation to the levers, and means for moving the-rear ends of the levers, whereby the work-holding jaws are moved toward and from each other.

3. A work holder comprising a slide, means for reciprocating said slide, a pair of work-holding levers mounted on said slide, said levers each provided at its inner end with an inwardly projecting pin, a dog mounted in the slide and extending into line between the adjacent ends of said pins, and means for forcing said dog between said pins and for withdrawing it.

'BoUeHToN T. NOBLE.

five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

